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const text = "Invalid student parameters. Error: Student stage \\\"patata\\\" is not a valid stage. Valid stages [infantil, primaria, secundaria]";

// CASE 1 (matched string + regex)
const regex = /\\"(.*?)\\"/g
text.match(regex) // output: '\"patata\"'

// CASE 2 (extended output)
const regex = /\\"(.*?)\\"/
text.match(regex)
/*
output:
[
  '\"patata\"',
  'patata',
  index: 49,
  input: 'Invalid student parameters. Error: Student stage \\"patata\\" is ' +
    'not a valid stage. Valid stages [infantil, primaria, secundaria]',
  groups: undefined
]
*/